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129 .\" ========================================================================
131 .IX Title "ASN1PARSE 1"
132 .TH ASN1PARSE 1 "2010-03-24" "0.9.8n" "OpenSSL"
134 asn1parse \- ASN.1 parsing tool
136 .IX Header "SYNOPSIS"
137 \&\fBopenssl\fR \fBasn1parse\fR
138 [\fB\-inform PEM|DER\fR]
139 [\fB\-in filename\fR]
140 [\fB\-out filename\fR]
142 [\fB\-offset number\fR]
143 [\fB\-length number\fR]
145 [\fB\-oid filename\fR]
146 [\fB\-strparse offset\fR]
147 [\fB\-genstr string\fR]
148 [\fB\-genconf file\fR]
150 .IX Header "DESCRIPTION"
151 The \fBasn1parse\fR command is a diagnostic utility that can parse \s-1ASN\s0.1
152 structures. It can also be used to extract data from \s-1ASN\s0.1 formatted data.
155 .IP "\fB\-inform\fR \fBDER|PEM\fR" 4
156 .IX Item "-inform DER|PEM"
157 the input format. \fB\s-1DER\s0\fR is binary format and \fB\s-1PEM\s0\fR (the default) is base64
159 .IP "\fB\-in filename\fR" 4
160 .IX Item "-in filename"
161 the input file, default is standard input
162 .IP "\fB\-out filename\fR" 4
163 .IX Item "-out filename"
164 output file to place the \s-1DER\s0 encoded data into. If this
165 option is not present then no data will be output. This is most useful when
166 combined with the \fB\-strparse\fR option.
167 .IP "\fB\-noout\fR" 4
169 don't output the parsed version of the input file.
170 .IP "\fB\-offset number\fR" 4
171 .IX Item "-offset number"
172 starting offset to begin parsing, default is start of file.
173 .IP "\fB\-length number\fR" 4
174 .IX Item "-length number"
175 number of bytes to parse, default is until end of file.
178 indents the output according to the \*(L"depth\*(R" of the structures.
179 .IP "\fB\-oid filename\fR" 4
180 .IX Item "-oid filename"
181 a file containing additional \s-1OBJECT\s0 IDENTIFIERs (OIDs). The format of this
182 file is described in the \s-1NOTES\s0 section below.
183 .IP "\fB\-strparse offset\fR" 4
184 .IX Item "-strparse offset"
185 parse the contents octets of the \s-1ASN\s0.1 object starting at \fBoffset\fR. This
186 option can be used multiple times to \*(L"drill down\*(R" into a nested structure.
187 .IP "\fB\-genstr string\fR, \fB\-genconf file\fR" 4
188 .IX Item "-genstr string, -genconf file"
189 generate encoded data based on \fBstring\fR, \fBfile\fR or both using
190 \&\fIASN1_generate_nconf()\fR format. If \fBfile\fR only is present then the string
191 is obtained from the default section using the name \fBasn1\fR. The encoded
192 data is passed through the \s-1ASN1\s0 parser and printed out as though it came
193 from a file, the contents can thus be examined and written to a file
194 using the \fBout\fR option.
196 .IX Subsection "OUTPUT"
197 The output will typically contain lines like this:
200 \& 0:d=0 hl=4 l= 681 cons: SEQUENCE
206 \& 229:d=3 hl=3 l= 141 prim: BIT STRING
207 \& 373:d=2 hl=3 l= 162 cons: cont [ 3 ]
208 \& 376:d=3 hl=3 l= 159 cons: SEQUENCE
209 \& 379:d=4 hl=2 l= 29 cons: SEQUENCE
210 \& 381:d=5 hl=2 l= 3 prim: OBJECT :X509v3 Subject Key Identifier
211 \& 386:d=5 hl=2 l= 22 prim: OCTET STRING
212 \& 410:d=4 hl=2 l= 112 cons: SEQUENCE
213 \& 412:d=5 hl=2 l= 3 prim: OBJECT :X509v3 Authority Key Identifier
214 \& 417:d=5 hl=2 l= 105 prim: OCTET STRING
215 \& 524:d=4 hl=2 l= 12 cons: SEQUENCE
220 This example is part of a self signed certificate. Each line starts with the
221 offset in decimal. \fBd=XX\fR specifies the current depth. The depth is increased
222 within the scope of any \s-1SET\s0 or \s-1SEQUENCE\s0. \fBhl=XX\fR gives the header length
223 (tag and length octets) of the current type. \fBl=XX\fR gives the length of
226 The \fB\-i\fR option can be used to make the output more readable.
228 Some knowledge of the \s-1ASN\s0.1 structure is needed to interpret the output.
230 In this example the \s-1BIT\s0 \s-1STRING\s0 at offset 229 is the certificate public key.
231 The contents octets of this will contain the public key information. This can
232 be examined using the option \fB\-strparse 229\fR to yield:
235 \& 0:d=0 hl=3 l= 137 cons: SEQUENCE
236 \& 3:d=1 hl=3 l= 129 prim: INTEGER :E5D21E1F5C8D208EA7A2166C7FAF9F6BDF2059669C60876DDB70840F1A5AAFA59699FE471F379F1DD6A487E7D5409AB6A88D4A9746E24B91D8CF55DB3521015460C8EDE44EE8A4189F7A7BE77D6CD3A9AF2696F486855CF58BF0EDF2B4068058C7A947F52548DDF7E15E96B385F86422BEA9064A3EE9E1158A56E4A6F47E5897
237 \& 135:d=1 hl=2 l= 3 prim: INTEGER :010001
241 If an \s-1OID\s0 is not part of OpenSSL's internal table it will be represented in
242 numerical form (for example 1.2.3.4). The file passed to the \fB\-oid\fR option
243 allows additional OIDs to be included. Each line consists of three columns,
244 the first column is the \s-1OID\s0 in numerical format and should be followed by white
245 space. The second column is the \*(L"short name\*(R" which is a single word followed
246 by white space. The final column is the rest of the line and is the
247 \&\*(L"long name\*(R". \fBasn1parse\fR displays the long name. Example:
249 \&\f(CW\*(C`1.2.3.4 shortName A long name\*(C'\fR
251 .IX Header "EXAMPLES"
255 \& openssl asn1parse -in file.pem
258 Parse a \s-1DER\s0 file:
261 \& openssl asn1parse -inform DER -in file.der
264 Generate a simple UTF8String:
267 \& openssl asn1parse -genstr 'UTF8:Hello World'
270 Generate and write out a UTF8String, don't print parsed output:
273 \& openssl asn1parse -genstr 'UTF8:Hello World' -noout -out utf8.der
276 Generate using a config file:
279 \& openssl asn1parse -genconf asn1.cnf -noout -out asn1.der
285 \& asn1=SEQUENCE:seq_sect
294 \& field2=EXP:0, UTF8:some random string
298 There should be options to change the format of output lines. The output of some
299 \&\s-1ASN\s0.1 types is not well handled (if at all).